Viessmann Climate Solutions Berlin GmbH

"very faulty equipment and expensive inspections to maintain the 1250 euro warranty"

"(Translated by Google) I attempted to reduce operating costs for my tenants by integrating a photovoltaic system into the expanded heating system. To be absolutely certain about the project, I purchased all components and the installation from Viessmann. The result is appalling! They've been tinkering with this system since March 2025, and to this day, nothing works! A successful energy transition in Germany is impossible if large, well-known companies like Viessmann don't take their customers' investments seriously and thus squander a massive amount of trust. I regret my decision to go with Viessmann, but they couldn't care less. (Original) I attempted to reduce operating costs for my tenants by integrating a photovoltaic system into the expanded heating system. To be absolutely certain about the project, I purchased all components and the installation from Viessmann. The result is appalling! They've been tinkering with this system since March 2025, and to this day, nothing works! A successful energy transition in Germany is impossible if large, well-known companies like Viessmann don't take their customers' investments seriously and thus squander a massive amount of trust. I regret my decision to go with Viessmann, but this company couldn't care less."

"We have a Vitocal 250 and it's a nightmare! Cold nights, no hot water – all because the software isn't up to scratch. The system keeps going into standby mode, the whole app is useless. And Viessmann simply doesn't respond. I wouldn't have expected this from a premium German product."

"My 10 kW Viessmann heat pump was installed just under a week ago, and so far I'm very satisfied. After fine-tuning the operating times and parameters, I'm particularly impressed by its energy efficiency and remarkably quiet operation. One area that definitely needs improvement is the app. It would be desirable if the app could not only display the water temperature but also automatically provide it at a user-defined time. Currently, I have to estimate the heat pump's start time myself based on the outside temperature and other values, which is cumbersome. Two other points concern the design and maintenance: It's puzzling why the wall vent was supplied in white when the heat pump itself is anthracite. I had to paint it myself. A cover that opens more easily would also be useful for periodic cleaning of the outdoor unit. Having to loosen numerous screws just to remove a few pine needles is impractical."

"The Viessmann Vitocaldens 222-F AC 29kW air source heat pump is simply junk! We are the "proud" owners of a Viessmann Vitocaldens 222-F AC 29kW air source heat pump. It was installed in our home in November 2022. After several repairs, the system has been out of service since February 2023. Apparently, a spare part has been missing for nine months!!!! We can only advise everyone to steer clear of this air source heat pump. If anyone from Viessmann is interested in this case, they should look under order number 201378077. Viessmann's customer service is a disaster!!!!!!!!!!"